Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 214 insertions, 0 deletions

diff --git a/drivers/platform/mips/cpu_hwmon.c b/drivers/platform/mips/cpu_hwmon.c
new file mode 100644
index 000000000..98128374d
--- /dev/null
+++ b/drivers/platform/mips/cpu_hwmon.c
@@ -0,0 +1,214 @@
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/jiffies.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+
+#include <loongson.h>
+#include <boot_param.h>
+#include <loongson_hwmon.h>
+
+/*
+ * Loongson-3 series cpu has two sensors inside,
+ * each of them from 0 to 255,
+ * if more than 127, that is dangerous.
+ * here only provide sensor1 data, because it always hot than sensor0
+ */
+int loongson3_cpu_temp(int cpu)
+{
+	u32 reg, prid_rev;
+
+	reg = LOONGSON_CHIPTEMP(cpu);
+	prid_rev = read_c0_prid() & PRID_REV_MASK;
+	switch (prid_rev) {
+	case PRID_REV_LOONGSON3A_R1:
+		reg = (reg >> 8) & 0xff;
+		break;
+	case PRID_REV_LOONGSON3A_R2:
+	case PRID_REV_LOONGSON3B_R1:
+	case PRID_REV_LOONGSON3B_R2:
+		reg = ((reg >> 8) & 0xff) - 100;
+		break;
+	case PRID_REV_LOONGSON3A_R3_0:
+	case PRID_REV_LOONGSON3A_R3_1:
+		reg = (reg & 0xffff)*731/0x4000 - 273;
+		break;
+	}
+	return (int)reg * 1000;
+}
+
+static int nr_packages;
+static struct device *cpu_hwmon_dev;
+
+static ssize_t get_hwmon_name(struct device *dev,
+			struct device_attribute *attr, char *buf);
+static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);
+
+static struct attribute *cpu_hwmon_attributes[] = {
+	&sensor_dev_attr_name.dev_attr.attr,
+	NULL
+};
+
+/* Hwmon device attribute group */
+static struct attribute_group cpu_hwmon_attribute_group = {
+	.attrs = cpu_hwmon_attributes,
+};
+
+/* Hwmon device get name */
+static ssize_t get_hwmon_name(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "cpu-hwmon\n");
+}
+
+static ssize_t get_cpu_temp(struct device *dev,
+			struct device_attribute *attr, char *buf);
+static ssize_t cpu_temp_label(struct device *dev,
+			struct device_attribute *attr, char *buf);
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu_temp_label, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu_temp, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu_temp_label, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, get_cpu_temp, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, cpu_temp_label, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, get_cpu_temp, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, cpu_temp_label, NULL, 4);
+
+static const struct attribute *hwmon_cputemp[4][3] = {
+	{
+		&sensor_dev_attr_temp1_input.dev_attr.attr,
+		&sensor_dev_attr_temp1_label.dev_attr.attr,
+		NULL
+	},
+	{
+		&sensor_dev_attr_temp2_input.dev_attr.attr,
+		&sensor_dev_attr_temp2_label.dev_attr.attr,
+		NULL
+	},
+	{
+		&sensor_dev_attr_temp3_input.dev_attr.attr,
+		&sensor_dev_attr_temp3_label.dev_attr.attr,
+		NULL
+	},
+	{
+		&sensor_dev_attr_temp4_input.dev_attr.attr,
+		&sensor_dev_attr_temp4_label.dev_attr.attr,
+		NULL
+	}
+};
+
+static ssize_t cpu_temp_label(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	int id = (to_sensor_dev_attr(attr))->index - 1;
+	return sprintf(buf, "CPU %d Temperature\n", id);
+}
+
+static ssize_t get_cpu_temp(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	int id = (to_sensor_dev_attr(attr))->index - 1;
+	int value = loongson3_cpu_temp(id);
+	return sprintf(buf, "%d\n", value);
+}
+
+static int create_sysfs_cputemp_files(struct kobject *kobj)
+{
+	int i, ret = 0;
+
+	for (i=0; i<nr_packages; i++)
+		ret = sysfs_create_files(kobj, hwmon_cputemp[i]);
+
+	return ret;
+}
+
+static void remove_sysfs_cputemp_files(struct kobject *kobj)
+{
+	int i;
+
+	for (i=0; i<nr_packages; i++)
+		sysfs_remove_files(kobj, hwmon_cputemp[i]);
+}
+
+#define CPU_THERMAL_THRESHOLD 90000
+static struct delayed_work thermal_work;
+
+static void do_thermal_timer(struct work_struct *work)
+{
+	int i, value, temp_max = 0;
+
+	for (i=0; i<nr_packages; i++) {
+		value = loongson3_cpu_temp(i);
+		if (value > temp_max)
+			temp_max = value;
+	}
+
+	if (temp_max <= CPU_THERMAL_THRESHOLD)
+		schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
+	else
+		orderly_poweroff(true);
+}
+
+static int __init loongson_hwmon_init(void)
+{
+	int ret;
+
+	pr_info("Loongson Hwmon Enter...\n");
+
+	cpu_hwmon_dev = hwmon_device_register(NULL);
+	if (IS_ERR(cpu_hwmon_dev)) {
+		ret = PTR_ERR(cpu_hwmon_dev);
+		pr_err("hwmon_device_register fail!\n");
+		goto fail_hwmon_device_register;
+	}
+
+	nr_packages = loongson_sysconf.nr_cpus /
+		loongson_sysconf.cores_per_package;
+
+	ret = sysfs_create_group(&cpu_hwmon_dev->kobj,
+				&cpu_hwmon_attribute_group);
+	if (ret) {
+		pr_err("fail to create loongson hwmon!\n");
+		goto fail_sysfs_create_group_hwmon;
+	}
+
+	ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
+	if (ret) {
+		pr_err("fail to create cpu temperature interface!\n");
+		goto fail_create_sysfs_cputemp_files;
+	}
+
+	INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
+	schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));
+
+	return ret;
+
+fail_create_sysfs_cputemp_files:
+	sysfs_remove_group(&cpu_hwmon_dev->kobj,
+				&cpu_hwmon_attribute_group);
+
+fail_sysfs_create_group_hwmon:
+	hwmon_device_unregister(cpu_hwmon_dev);
+
+fail_hwmon_device_register:
+	return ret;
+}
+
+static void __exit loongson_hwmon_exit(void)
+{
+	cancel_delayed_work_sync(&thermal_work);
+	remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
+	sysfs_remove_group(&cpu_hwmon_dev->kobj,
+				&cpu_hwmon_attribute_group);
+	hwmon_device_unregister(cpu_hwmon_dev);
+}
+
+module_init(loongson_hwmon_init);
+module_exit(loongson_hwmon_exit);
+
+MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");
+MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
+MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
+MODULE_LICENSE("GPL");